Turkish army on Sunday said it has killed over 900 Kurdish fighters, while Syrian Kurdish health officials said on Saturday that 150 civilians had been killed and 300 wounded since the start of the Turkish operation on Jan. 20.

Thousands of people have been displaced by the Turkish-led offensive that also involves about 10,000 Syrian rebels, it said.

Ursula Mueller, the Deputy UN Emergency Relief Coordinator, said on Thursday that the situation is most concerning in north-west Syria where recent fighting has claimed many lives and forced over 270,000 civilians to flee for safety.

Russian Foreign Ministry spokeswoman Maria Zakharova said on Wednesday that "several hundred people, including civilians, have already been killed in the 10 days since hostilities began."

France and Turkey will be working on a "diplomatic road map" for an end to the nearly seven-year war in Syria, French President Emmanuel Macron's office said on Sunday.

The announcement came after Macron spoke by telephone with Turkish President Recep Tayyip Erdoğan on Saturday which discussed in particular Turkey's operation against Kurdish People's Protection Units (YPG) militia in Syria, AFP reported.

Macron had incensed Turkish officials last week by saying in a newspaper interview that France would have a "real problem" with the campaign if it turned out to be an "invasion operation".

Turkey's state-run Anadolu news agency reported Saturday that Erdoğan had sought to reassure Macron during their talk, saying Ankara had no eye on Syrian territory.